The phone code 1664 at the beginning of the phone number +1664 (subscriber’s phone) means that you are being called from Montserrat or you are calling a subscriber registered in Montserrat.
+1664 — Montserrat
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Telephone Code +1664 — what country it is
The international phone code +1664 officially belongs to Montserrat, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “1664″ after the “+” sign to call to Montserrat. Then the next digits of the phone number can be entered.
Whose country code is +1664?
+1664 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Montserrat. It does not mean that a subscriber is definitely there at the time of the call (since he or she can make a call in roaming), but there is such a possibility.